Orconectes immunis (Hagen, 1870)

English Papershell crayfish Status LU: absent.
Lëtzebuergesch Kalikokriibs Status Eur.: established.
Français Ecrevisse calicot RA: ISEIA: A0, Alert List. Harmonia+: n/a.
Deutsch Kalikokrebs Wikipedia: Wikipedia - English - Orconectes immunis  Wikipedia - Français - Ecrevisse calicot Wikipedia - Deutsch - Kalikokrebs Nederlands - Calicotrivierkreeft | Wikispecies: n/a (2020)
Nederlands Calicotrivierkreeft Back to the list of invertebrates

Brief description

Orconectes immunis Kalikokrebs calico crayfishOrconectes immunis is a species of crayfish in the family Cambaridae. It is native to North America and it is an introduced species in Europe. O. immunis is only found in slow-flowing bodies of water, such as streams, ponds, marshes and roadside ditches, in contrast to O. virilis which also lives in rivers with moderate flow. It can survive in areas with large fluctuations in the amount of available water, by burrowing into the ground when the surface waters recede. Orconectes immunis has been popular in the aquarium trade in Germany, and is kept as a pet both in aquaria and garden ponds. The first recorded escape was a single individual in a small canal in the Rhine valley of Baden-Württemberg in 1997. It appears to be outcompeting another invasive species, Orconectes limosus, which has been present in the area for five decades (Wikipedia contributors 2018).

Status and distribution in Luxembourg

Orconectes immunis (Hagen, 1870) has not yet been documented in Luxembourg (MNHNL, iNaturalist & GBIF 2020). The species is spreading in several neighbouring countries as France and Germany (cf. Albes 2019).

Risk assessment

ISEIA protocol

A0 (3+3+3+2) = Alert List (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Worldwide distribution

Bibliography

  • Albes, J., 2019. Invasoren mit Scheren – Der amerikanische Kalikokrebs vermehrt sich rasant im Rheintal – Für die hiesige Tierwelt eine Katastrophe. Journal 2019-12-11: 18. [PDF 168 KB]
  • GBIF 2020. Orconectes immunis (Hagen, 1870) in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei [accessed 2020-03-13]
  • MNHNL, iNaturalist & GBIF, 2020. Orconectes immunis in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [accessed 2020-03-13]
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Wikipedia contributors, 2018. ‘Orconectes immunis’, Wikipedia, The Free Encyclopedia, 14 October 2018, 18:38 UTC, <https://en.wikipedia.org/w/index.php?title=Orconectes_immunis&oldid=864041343> [accessed 2020-03-13]

 Page content last updated on 2020-05-04.

Dicranopalpus ramosus (Simon, 1909)

English n/a Status LU: established. 1st record:2007.
Lëtzebuergesch Streckfouss Status Eur.: established.
Français n/a RA: ISEIA: C2. Harmonia+: n/a.
Deutsch Streckfuß Wikipedia: Wikipedia - English - Dicranopalpus ramosus Wikipedia - Français - Dicranopalpus ramosus Wikipedia - Deutsch - Nederlands - Strekpoot | Wikispecies: n/a (2020)
Nederlands Strekpoot Back to the list of invertebrates

Brief description

4139 Dicranopalpus ramosusOriginally the species was found in Morocco. Later it spread into Europe, with first reports in Portugal (1948), where it spread to Spain (1965) and France (1969). The Netherlands were reached in 1992. Since 2004 it is known to occur in Germany. As early as 1957, it was reported in Bournemouth, southern England, from where it spread all over the island, reaching Scotland in 2000. In 2010, one occurrence in Denmark was documented (Wikipedia contributors 2019).

Status and distribution in Luxembourg

Records of Dicranopalpus ramosus (Simon, 1909) in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2022-10-06.

Dicranopalpus ramosus (Simon, 1909) was first documented by Dieter Weber on 18 August 2007 in the railway tunnel near Junglinster (MNHNL 2000-).

Currently, 5 records of the species are accessible through the MNHNL-mdata portal (MNHNL, iNaturalist & GBIF 2019).

While it appears to be widespread in the Gutland, the species seems to be largely missing in the Ösling (Muster & Meyer 2014: 38-39).

Risk assessment

ISEIA protocol

C2 (2+2+2+1) (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Worldwide distribution

Bibliography

  • GBIF, 2020. Dicranopalpus ramosus in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei [accessed 2020-03-05]
  • MNHNL, 2000-. Dicranopalpus ramosus (Simon, 1909) in Recorder-Lux, database on the natural heritage of the Grand Duchy of Luxembourg. Musée national d’histoire naturelle, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-10-24]
  • MNHNL, iNaturalist & GBIF, 2019. Dicranopalpus ramosus (Simon, 1909) in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-10-24]
  • Muster, C. & M. Meyer, 2014. Verbreitungsatlas der Weberknechte des Großherzogtums Luxemburg. Ferrantia 70, Musée national d’histoire naturelle, Luxembourg, 112 p.
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Wikipedia contributors, 2019. Dicranopalpus ramosus (Simon, 1909) in Wikipedia, The Free Encyclopedia, 25 July 2018, 21:25 UTC, URL: https://en.wikipedia.org/w/index.php?title=Dicranopalpus_ramosus&oldid=851987120 [accessed 24 October 2019]

 Page content last updated on 2020-05-04.

Brigittea civica (Lucas, 1850)

English n/a Status LU: established. 1st record: 2008.
Lëtzebuergesch Biergerlech Mauerspann[1]Brigittea = DE: Mauerspinnen = LB: Mauerspannen. LA: Adj. civicus = LB: biergerlech. Status Eur.: established.
Français n/a RA: ISEIA: C3. Harmonia+: n/a.
Deutsch Echte Mauerspinne[2]Cf. Wiki der Arachnologischen Gesellschaft e. V.-Bearbeiter (2020). Wikipedia: Wikipedia - English - Brigittea civica Nederlands - Zuiders kaardertje | Wikispecies: n/a (2017)
Nederlands Zuiders kaardertje Back to the list of invertebrates

Brief description

Brigittea civica 02Brigittea civica (Lucas, 1850) is distributed in Europe, North Africa, Turkey, Iran and introduced to North America (Nentwig et al. 2020). In Central Europe, it is mainly known as a resident of house facades, which gave it the trivial name “wall spider”. On structured walls it spins around its hiding place, usually a recess in the plaster, a ruffled web up to the size of a palm. In this net not only the prey of the spider is caught, but also street dust, so that the settlement of even light-coloured house walls can be easily recognised from a distance (Hohner 2019). The species occurs synanthropically in central European conditions. It is well adapted to coexistence with humans, and since there is no natural enemy, it may freely redistribute (Novotný et al. 2017).

Status and distribution in Luxembourg

Records of Brigittea civica (Lucas, 1850) in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2022-10-06.

Since 2008, 30 occurrences of the species have been documented in Luxembourg in the Recorder-Lux database under it’s synonym Dictyna civica (MNHNL, iNaturalist & GBIF 2020). The status appears unclear and is estimated to be very common in Luxembourg. The current (2020) distribution is probably linked to the fact that the only person reporting the species is living in the Moselle area.

The status of the species seems unclear in other European countries, e.g. in the Czech Republic, where it is considered to probably be non-native; furthermore a study suggests that Brigittea civica is much more common than was previously mapped and the presence of this species in the Czech Republic was underestimated (Novotný et al. 2017).

Risk assessment

ISEIA protocol

C3 (2+1+2+1) (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Distribution in Europe

Source: https://www.gbif.org/species/7555806

Worldwide distribution

Bibliography

  • CABI, 2019. Brigittea civica (Lucas, 1850) . In: Invasive Species Compendium. Wallingford, UK: CAB International. URL: www.cabi.org/isc [accessed 2020-03-04]
  • GBIF, 2020. Brigittea civica (Lucas, 1850) in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei [accessed 2020-03-04]
  • Hohner, M., 2019. Neue Nachweise von Brigittea civica (Araneae: Dictynidae) in Bayern. Arachnologische Mitteilungen: Arachnology Letters 57(1): 84-86.
  • MNHNL, iNaturalist & GBIF, 2020. in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2020-03-04]
  • Nentwig W, Blick T, Bosmans R, Gloor D, Hänggi A, Kropf C, 2020. Version {2}.2020. Online at https://www.araneae.nmbe.ch. https://doi.org/10.24436/1 [Accessed 2020-03-04]
  • Novotný, B., V. Hula & J. Niedobová, 2017. Insufficiency in Distributional Faunistic Data in Synanthropic Spiders: a Case Study of the Occurrence of Brigittea Civica (Araneae, Dictynidae) in South Moravia, Czech Republic. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 65(3):899-906. DOI: 10.11118/actaun201765030899
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Wiki der Arachnologischen Gesellschaft e. V.-Bearbeiter, 2020. Brigittea civica. Wiki der Arachnologischen Gesellschaft e. V. URL: https://wiki.arages.de/index.php?title=Brigittea_civica&oldid=118852 [accessed 2020-03-05]

 Page content last updated on 2020-12-08.

References

References
1 Brigittea = DE: Mauerspinnen = LB: Mauerspannen. LA: Adj. civicus = LB: biergerlech.
2 Cf. Wiki der Arachnologischen Gesellschaft e. V.-Bearbeiter (2020).

DNADIVE – New research project on invasive crayfish

See the project web page at https://faune-flore.lu/dnadive/

DNADIVE aims to develop a molecular toolbox enabling eDNA detection for Invasive crayfish in streams of Luxembourg. This Public2 Partnership project was accepted by FNR in November 2017 and will start on 1st January 2018. The project will be hosted by Fondation faune-flore and its principal investigator will be the French researcher Dr David Porco. Project partnership: Luxembourg National Museum of Natural History (MNHNL), Luxembourg Institute of Science & Technology (LIST), Water management Agency (AGE), Ministry for Sustainable Development and Infrastructure (MDDI), University of Duisburg-Essen (Germany).

Abstract

DNADIVE aims to develop a toolbox for the molecular monitoring of invasive crayfish in the streams of Luxembourg. Three exotic species (Orconectes limosus, Pacifastacus leniusculus and Astacus leptodactylus) and a native one (Astacus astacus) will be targeted for the project.

This molecular toolbox will encompass several techniques of detection comprising (1) a simple amplification method easily performed in a laboratory with few elements, (2) a digital droplet amplification (ddPCR) which is a more elaborated lab method that can allow for a higher detection sensitivity and a possible quantification of DNA that could be related through the proxy of biomass and abundance to the size of the populations detected and (3) an isotherm amplification method (iPCR) i.e. a simple, cost effective approach which will allow for field detection usable by untrained individuals.

The results will enable the development of a predictive species distribution model for the target species and to infer their impact on freshwater communities through the comparison with previous sampling campaigns. This set of methods has the high potential to efficiently contribute to early detection and routine monitoring of the invasive crayfish species in Luxembourg, thus allowing for timely and efficient decision-making and appropriate management.

 Page content last updated on 2019-11-12. Last proofread by Caroline Grounds on 2019-11-12.

Luxembourg reports Nutria to the EU within the EASIN notification system

On 19th September 2017, a forester captured a Nutria (Myocastor coypus) in Osweiler (commune of Rosport, eastern Luxembourg) and put it to sleep.

The Luxembourg authorities were notified of this detection of an IAS of Union concern (Anonymous 2016) on 26 September 2017 and an Eradication Measure Set was also submitted on 26 September 2017, pursuant to Article 16(2) of R. 1143/2014 (Anonymous 2014).

Biberratte - Nutria - coypu - Myocastor coypus - ragondin - castor des marais - Mönchbruch - December 25th 2012 - 03

Coypu (Myocastor coypus), Moenchbruch lake, Hesse, Germany.
By Norbert Nagel (Own work) [CC BY-SA 3.0], via Wikimedia Commons

The species was first documented in Luxembourg in 1957 at the Alzette river next to Hunsdorf (Municipality of Lorentzweiler). Currently, it is only observed sporadically in Luxembourg. Because of its occurrence in the bordering regions of France (Chiers, Moselle) and Germany (Saar), it is likely that the species will populate national watercourses within the near future (Becker-Krüll & Schaefer 2013).

Bibliography

  • Anonymous, 2014. Regulation (EU) No 1143/2014 of the European Parliament and of the Council of 22 October 2014 on the prevention and management of the introduction and spread of invasive alien species. Official Journal of the European Union 4.11.2014 L 317: 35-55.
  • Anonymous, 2016. Commission implementing regulation (EU) 2016/1141 of 13 July 2016 adopting a list of invasive alien species of Union concern pursuant to Regulation (EU) No 1143/2014 of the European Parliament and of the Council. Official Journal of the European Union L 189: 4-5.
  • Becker-Krüll, L. & P. Schaefer, 2013. Jagdbare Wildtierarten Luxemburgs. Administration de la nature et des forêts, Luxembourg, 96 pp.

 Page content last updated on 2021-04-14. Last proofread by Caroline Grounds on 2019-11-12.

2016 Mosquito survey catches identified

In 2016, the Luxembourg National Natural History Museum started a survey on mosquito species in Luxembourg. Between July and October mosquitoes have been trapped on a weekly basis at 10 sites throughout the country, in co-operation with local and regional partner organizations and private individuals.

On June 14th and 15th 2017, Mosquito specialist Dr Francis Schaffner from the University of Zurich identified the 2016 catches at the Museum.

F.l.t.r.: Svenja Christian (Department of Invertebrates Zoology MNHNL) and Dr Francis Schaffner (University of Zurich) in the Lab of the Department of Ecology. Photo: Dr Christian Ries, MNHNL, 15 June 2017.

Results

182 mosquitoes were caught during 90 catches from 10 sites.

Culex pipiens / torrentium (9 out of 10 sites)
175
Anopheles plumbeus (Kockelscheuer, Steinsel)
3
Culiseta annulata (Remerschen)
1
Coquillettidia richiardii (Remerschen)
1
Aedes vexans (Kockelscheuer)
1
Aedes cinereus (Kockelscheuer) 1

Locality, Partners (#Catches|#Specimen)

We thank the following partners who have run the traps on their sites.

  • Diekirch, Administration de la nature et des forêts (11|0)
  • Esch-sur-Sûre, Naturpark Öewersauer (PNHS) (12|9)
  • Kalborn-Moulin, natur&ëmwelt – Fondation Hëllef fir d’Natur (10|6)
  • Kockelscheier, natur&ëmwelt – Haus vun der Natur (11|48)
  • Leudelange, private owner (10|27)
  • Lintgen, private owner (9|23)
  • Luxembourg / Grund, MNHNL (11|19)
  • Remerschen, Biodiversum (5|16)
  • Schrassig, private owner (6|24)
  • Steinsel, private owner (5|10)

 Page content last updated on 2019-11-12. Last proofread by Caroline Grounds on 2019-11-12.

Pectinatella magnifica (Leidy, 1851)

English Magnificent bryozoan Status LU: established. 1st record: ~2011.
Lëtzebuergesch Schwamp-Moosdéierchen Status Eur.: established.
Français Pectinatelle RA: ISEIA: C1. Harmonia+: n/a.
Deutsch Schwammartiges Moostierchen Wikipedia: Wikipedia - English - Greater duckweed Wikipedia - Français - Lentille d'eau géante Wikipedia - Deutsch - Vielwurzelige Teichlinse Nederlands | Wikispecies: Wikispecies - Pectinatella magnifica
Nederlands n/a Back to the list of invertebrates

Brief description

Pectinatella magnifica 02Pectinatella magnifica, the magnificent bryozoan, is a member of the Bryozoa phylum, in the order Plumatellida. It is a colony of organisms that bind together; these colonies can sometimes be 60 centimeters in diameter. These organisms can be found mostly in North America with some in Europe. They are often found attached to objects, but can be found free floating as well. They form a translucent body with many star-like blooms along the outside. The density of the organism is similar to that of gelatin, and is easily breakable into smaller chunks (Wikipedia contributors 2018).

Status and distribution in Luxembourg

Records of Pectinatella magnifica (Leidy, 1851) in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2022-10-06.

In 2012 numerous colonies of Pectinatella magnifica (Leidy, 1851) (Bryozoa, Phylactolaemata) were discovered in the reservoir of Esch-sur-Sûre (Luxembourg) fed by the river Sûre. The colonies were particularly abundant in the shallow, warm and nutrient-rich water near the riverbank, but some colonies were spotted by divers in the reservoir at a depth of 8-9 m in one site and more than 20 m in another site. There is reliable evidence that Pectinatella was present, but less conspicuous and as such not identified, in 2011 and possibly already in 2010. P. magnifica was hitherto unrecorded in Luxembourg, but known from a site near the German-Luxembourg border near Nennig (Germany, Saarland) where statoblasts were found in 2001 (Massard et al. 2013).

Three records of the species are accessible through the MNHNL-mdata portal (MNHNL, iNaturalist & GBIF, 2021).

Risk assessment

ISEIA protocol

C1 (3+2+1+1) (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Worldwide distribution

Bibliography

  • GBIF, 2019. Pectinatella magnifica (Leidy, 1851) in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei [accessed 2020-03-13]
  • Massard, J.A., G. Geimer & E. Wille, 2013. Apparition de Pectinella magnifica (Leidy, 1851) (Bryozoa, Phylactolaemata) dans le lac de barrage d’Esch-sur-Sûre (Luxembourg). Bulletin de la Société des naturalistes luxembourgeois 114: 131-148.
  • Massard, J.A. & G. Geimer, 2015. L’’histoire de la recherche bryozoologique au Luxembourg (Phylactolémates et Gymnolémates d’eau douce). Bull. Soc. Nat. luxemb. 116: 373-379. [PDF 1,35 MB]
  • MNHNL, iNaturalist & GBIF, 2021. MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2021-04-14]
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Wikipedia contributors, 2018. ‘Pectinatella magnifica’, Wikipedia, The Free Encyclopedia, 3 December 2018, 23:25 UTC, <https://en.wikipedia.org/w/index.php?title=Pectinatella_magnifica&oldid=871869936> [accessed 2020-03-13]

 Page content last updated on 2021-04-14. Last proofread by Caroline Grounds on 2019-11-12.

Varroa destructor Anderson & Trueman, 2000

English Varroa mite Status LU: established. 1st record: 1985.
Lëtzebuergesch Varroamilb Status Eur.: established.
Français n/a RA: ISEIA: A3, Black List. Harmonia+: n/a.
Deutsch Varroamilbe Wikipedia: Wikipedia - English - Varroa mite Wikipedia - Français - Varroa destructor Wikipedia - Deutsch - Varroamilbe Nederlands | Wikispecies: Wikispecies - Varroa destructor | CABI
Nederlands Varroamijt Back to the list of invertebrates

Brief description

7-Varroa destructor on head bee pupa3 by Gilles San MartinVarroa destructor Anderson & Trueman, 2000 is an external parasitic mite that attack and feeds on the honey bees Apis cerana and Apis mellifera. The disease caused by the mites is called varroosis. The Varroa mite can only reproduce in a honey bee colony. It attaches to the body of the bee and weakens the bee by sucking fat bodies. The species is a vector for at least five debilitating bee viruses, including RNA viruses such as the deformed wing virus (DWV). A significant mite infestation leads to the death of a honey bee colony, usually in the late autumn through early spring. The Varroa mite is the parasite with possibly the most pronounced economic impact on the beekeeping industry. Varroa is considered to be one of multiple stress factors contributing to the higher levels of bee losses around the world.

The adult female mite is reddish-brown in color, while the male is white. Varroa mites are flat, having a button shape. They are 1–1.8 mm long and 1.5–2 mm wide, and have eight legs. Mites reproduce on a 10-day cycle (Wikipedia contributors 2020).

Status and distribution in Luxembourg

Varroa destructor Anderson & Trueman, 2000 was observed for the first time in Luxembourg in 1985 (Meisch 1986). Claude Meisch recalls: “At that time it was a delicate matter, no beekeeper wanted to admit that he had the parasite in his hives. I remember well that I was the first to admit in meetings that I had found Varroa in my hives. Probably Varroa was already widespread in the whole country at that time” (Meisch 2018).

In the 1980s, Varroa spread throughout the country and is nowadays present in every beehive.

There is no distribution map available because no data has been entered into the Recorder-Lux database so far (MNHNL, iNaturalist & GBIF 2019).

Risk assessment

ISEIA protocol

A3 (3+3+3+3) = Black List (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Worldwide distribution

CABI 2008: https://www.cabi.org/isc/datasheet/107784#toDistributionMaps

Bibliography

  • CABI, 2008. Varroa destructor Anderson & Trueman, 2000 [original text by Claire Beverley]. In: Invasive Species Compendium. Wallingford, UK: CAB International. URL: www.cabi.org/isc [accessed 2019-11-26]
  • MNHNL, iNaturalist & GBIF, 2019. MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-10-24]
  • Meisch, C., 1986. Die Varroamilbe. Geschichte der Ausbreitung, Portrait und Biologie. Pp. 174-177 in: Livre d’or du centenaire 1886-1986. Fédération des unions d’apiculteurs du grand-duché de Luxembourg.
  • Meisch, C., 2018. Personal communication to Lucie Lentz during Summer 2018.
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Wikipedia contributors, 2020. ‘Varroa destructor’, Wikipedia, The Free Encyclopedia, 19 February 2020, 15:24 UTC, <https://en.wikipedia.org/w/index.php?title=Varroa_destructor&oldid=941598994> [accessed 2020-03-13]

 Page content last updated on 2021-05-14. Last proofread by Caroline Grounds on 2019-12-12.

Opilio canestrinii (Thorell, 1876)

English n/a Status LU: established. 1st record: 2009.
Lëtzebuergesch Roude Schneider Status Eur.: established.
Français n/a RA: ISEIA: B3, Watch List. Harmonia+: n/a.
Deutsch Apenninen-Kanker Wikipedia: Wikipedia - English - Opilio canestrinii Wikipedia - Français - Opilio canestrinii Nederlands | Wikispecies: n/a (2020) | CABI
Nederlands Rode hooiwagen Back to the list of invertebrates

Brief description

Opilio canestrinii LC0163Opilio canestrinii is a species of harvestman. Males reach a body length up to 6 mm, females up to 8 mm. While males are yellowish brown to reddish, females are lighter. Males have dark legs, but yellow coxae and “knees”; the legs of females show alternately light and dark rings. The backs of females sport a dark, saddle-like pattern with a light longitudinal stripe in the middle. Adults can be found from June to December.

O. canestrinii probably originates from Italy, but has invaded Central Europe since the late 1970, and has since almost everywhere replaced the similar O. parietinus. It is most often found on house walls (Wikipedia contributors 2019).

Status and distribution in Luxembourg

Records of Opilio canestrinii (Thorell, 1876) in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2022-10-06.

The first documented occurrence of the species in Luxembourg dates from 2009. It was found by C. Muster on 20th August 2009 in Fort Berlaimont (Municipality of Luxembourg).

Opilio canestrinii is the second most common harvestman in Luxembourg and can be found in every region of the country.

Opilio canestrinii colonises a number of open habitats independently of their moisture levels. It is very successful in man-made landscapes, even in bigger cities. It is a strong competitor to native species and seems able to displace or even replace them. There are indicators that the similar Opilio parietinus, traditionally a common species on house walls, has nearly vanished, just a few years after the arrival of O. canestrinii.

Several sources describe this harvestman as a typical species of urban areas. In Luxembourg however, the data provided from different projects show evidence that the species occurs in great numbers and important percentages even in close-to-nature areas. Since the 1960s, O. canestrinii has spread extremely quickly northwards through Europe and has become a more or less common species in their new areas.

Risk assessment

ISEIA protocol

B3 (3+2+3+1) = Watch List (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Worldwide distribution

Bibliography

  • CABI, 2019. Opilio canestrinii. In: Invasive Species Compendium. Wallingford, UK: CAB International. URL: www.cabi.org/isc [accessed 2020-03-05]
  • GBIF, 2020. Opilio canestrinii in GBIF Secretariat (2019). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei [accessed 2020-03-05]
  • MNHNL, iNaturalist & GBIF, 2020. Opilio canestrinii in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2020-03-05]
  • Muster, C. & M. Meyer, 2014. Verbreitungsatlas der Weberknechte des Großherzogtums Luxemburg. Ferrantia 70. Musée national d’histoire naturelle, Luxembourg, 112 S. (PDF 3.8 MB)
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Weber, D. (Hrsg.), 2014. Die Höhlenfauna Luxemburgs. Ferrantia 69. Musée national d’histoire naturelle Luxembourg, 408 pp. + CD-Rom (PDF 19 MB)
  • Wikipedia contributors, 2019. Opilio canestrinii. Wikipedia, The Free Encyclopedia, 17 January 2019, 10:39 UTC, &lt;https://en.wikipedia.org/w/index.php?title=Opilio_canestrinii&amp;oldid=878854172&gt; [accessed 2020-03-05]

 Page content last updated on 2021-05-14. Last proofread by Caroline Grounds on 2019-12-10.

Leiobunum sp.

English n/a Status LU: established. 1st record: ?
Lëtzebuergesch n/a Status Eur.: established. 1st record: ~2000 (NL).
Français n/a RA: ISEIA: C2. Harmonia+: n/a.
Deutsch Namenloser Rückenkanker Wikipedia: Wikipedia - English - Leiobunum Wikipedia - Deutsch - Namenloser Rückenkanker Nederlands | Wikispecies: n/a (2020)
Nederlands n/a Back to the list of invertebrates

Brief description

Mainz fg03Since probably 2000, a completely unknown harvestman started its quick expansion through Central Europe. The species could be classified in the genus Leiobunum, but is different from other European species. It has been named provisionally as Leiobunum sp. (sensu Wijnhoven et al. 2007). It is assumed that it arrived with ships from overseas, probably reaching the Netherlands first. It is still unknown exactly where it came from (Wijnhoven et al. 2007).

The area of origin is unknown to date, since about 2000 the species has probably spread from the Netherlands into Western Germany on both sides of the Rhine valley to Switzerland and Vorarlberg (Wijnhoven et al. 2007), in the meantime also to Schleswig-Holstein (Staudt 2012).

Habitat: Primarily possibly a rock dweller, in Europe in habitats of anthropogenic origin: industrial wastelands, ruins and house walls (Wijnhoven et al. 2007). Leiobunum sp. generally tend to cluster together during the day. This behaviour is even more pronounced in the species in question. Mass aggregations of several hundreds of individuals have been observed. Many observations show that in spite of its high reproduction rate this “new” Leiobunum sp. seems to coexist well with indigenous species and integrates in the native fauna without great damage. But surely great colonies of the species compete for food with other similar predators.

Status and distribution in Luxembourg

Distribution map of Leiobunum sp. in Luxembourg. Source: Muster & Meyer 2014: 80.

No records of Leiobunum sp. (sensu Wijnhoven et al. 2007) are present in the MNHNL-mdata portal (MNHNL, iNaturalist & GBIF, 2020).

Already widespread in the Gutland, Leiobunum sp. still largely absent in the Ösling (Muster & Meyer 2014: 79). In Luxembourg exclusively synanthropic, larger aggregations have so far only been observed on industrial ruins in the Minette area, in small numbers of individuals in many places on average house walls.

Remarks (Muster & Meyer 2014: 82): Due to the occurrence of mass aggregations with > 1000 specimens the species became the focus of media and sensation-hungry public after 2007. Suddenly, weavers were the focus of exhibitions, local publications, radio and television broadcasts. Wijnhoven et al. (2007) also warned urgently of an imminent invasion of unprecedented proportions and possible dramatic effects on the native opilionid fauna. A few years after this initial uncertainty, the situation is now much more relaxed. Despite the now widespread distribution in Luxembourg, no mass increases could be registered. Only in the former Goodyear test site near Esch-sur-Alzette and at industrial ruins near Rodange larger colonies of 100-200 specimens were sighted. Otherwise only smaller groups of maximum 10 specimens were observed, often only single specimens. It was noticeable that often only one dwelling house per small village was inhabited, while other similar houses remained unoccupied. In this context, observations from the Ruhr area seem interesting, according to which the animals show a preference for calcareous surfaces rich in structure (Toss 2010). The effects on other weaver’s apprentice species are also likely to be less severe than originally assumed. Leiobunum rotundum is often found at or even within aggregations of the Nameless Spine Anchor, while they even seem to evade Dicranopalpus ramosus (Wijnhoven 2011).

Risk assessment

ISEIA protocol

C2 (2+2+2+1) (Ries et al. 2017: 68).

Harmonia+ protocol

Not assessed yet.

Bibliography

  • MNHNL, iNaturalist & GBIF, 2020. MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2020-03-05]
  • Muster, C. & M. Meyer, 2014. Verbreitungsatlas der Weberknechte des Großherzogtums Luxemburg, Ferrantia 70. Musée national d’histoire naturelle, Luxembourg, 112 S. [pp. 79-82] (PDF 3.8 MB)
  • Ries, C., A. Arendt, C. Braunert, S. Christian, A. Dohet, A. Frantz, G. Geimer, M. Hellers, J. A. Massard, X. Mestdagh, R. Proess, N. Schneider & M. Pfeiffenschneider, 2017. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of invertebrates in Luxembourg. Bull. Soc. Nat. luxemb. 119: 63-70. [PDF 360 KB]
  • Staudt, A., 2012. Nachweiskarten der Spinnentiere Deutschlands (Arachnida: Araneae, Opiliones, Pseudoscorpiones). http://www.spiderling.de/arages/
  • Toss, K., 2010. Auffällig unauffällig: Der bislang unbestimmte Weberknecht der Gattung Leiobunum ist im westlichen Ruhrgebiet weit verbreitet. Elektronische Aufsätze der Biologischen Station Westliches Ruhrgebiet 19: 1-5.
  • Wijnhoven, H., A.L. Schönhofer & J. Martens, 2007. An unidentified harvestman Leiobunum sp. alarmingly invading Europe (Arachnida: Opiliones). Arachnol. Mitt. 34: 27-38. (https://www.natur-in-nrw.de/Download/Martens_Leiobunum_2007.pdf)

 Page content last updated on 2020-03-05. Last proofread by Caroline Grounds on 2019-12-10.